Add setDefault function

Author: EndBug

src/main.ts

@@ -13,12 +13,18 @@ function checkInputs() {
   const eventPath = process.env.GITHUB_EVENT_PATH
   if (eventPath) {
     const { author } = require(eventPath).head_commit
-    if (!process.env.INPUT_AUTHOR_NAME) process.env.INPUT_AUTHOR_NAME = author.name
-    if (!process.env.INPUT_AUTHOR_EMAIL) process.env.INPUT_AUTHOR_EMAIL = author.email
+    setDefault('author_name', author.name)
+    setDefault('author_email', author.email)
   } else {
     core.warning('No event path available, unable to fetch author info.')
-    if (!process.env.INPUT_AUTHOR_NAME) process.env.INPUT_AUTHOR_NAME = 'Add & Commit Action'
-    if (!process.env.INPUT_AUTHOR_EMAIL) process.env.INPUT_AUTHOR_EMAIL = 'actions@github.com'
+    setDefault('author_name', 'Add & Commit Action')
+    setDefault('author_email', 'actions@github.com')
   }
+  core.info(`Using '${core.getInput('author_name')} <${core.getInput('author_email')}>' as author.`)
   core.info(`Using '${process.env.INPUT_AUTHOR_NAME} <${process.env.INPUT_AUTHOR_EMAIL}>' as author.`)
 }
+
+function setDefault(input: string, value: string) {
+  const key = 'INPUT_' + input.toUpperCase()
+  if (!process.env[key]) process.env[key] = value
+}